Chain hoist



V 2 Sheets-'Sheet 1. 0. A. TEAL.

CHAIN HOIST.

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Patented Apr. 8, 1884.

1' "Hull I t I R (N0 Model.) 2 SheetsSheet 2. G. A. TEAL.

GEAIN HOIST.

No. 296,364. Patented Apr. 8, 1884.

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CHARLES A TEAL, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO MARTHA R. 1?. TEAL, OF SAME PLACE.

HOIST.

SPECIFICATION forming part of Letters Patent No. 296,364, dated April 8, 1884.

Application filed February 15, 1884. (No model.)

To (0Z5 whom it may concern.-

Be it known that I, CHARLES A. TEAL, a citizen of the United States, and a resident of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain Improvements in Chain-Hoists, of which the following is a specification.

My invention relates to ehain hoists such as are generally used in raising or lowering heavy bodies and are operated by hand; and it has for its obj eet to construct a simple, cheap, and durable chain-hoist that can "be conveniently used and easily operated, and at the same time will be capable of exerting great power.

In carrying out my invention a suitable strong and substantial frame-work is provided for supporting the shafts, and upon the central or main shaft, and preferably outside of the frame, is provided a comparatively large hand chain-wheel or drive-pulley, which is preferably provided with corrugations, projections, or sprockets on its bearing-surface, to prevent the endless hand-chain from slipping, and upon the same shaft is fixed a pinion-wheel. At each side of the main shaft is another shaft supported in the frame, and upon these shafts are secured gear-wheels engaging with the pinion-wheel, and secured upon the same shafts,

\ and preferably close to the gear-wheels, are

the chain-pulleys. To produce the differential action of the'chain-pulleys upon the chain, the chain-pulleys may be of the same diameter and the gear-wheels engaging with the pinion on the main shaft of different diameters, and this will cause the part of the chain passing over the pulley attached. to the shaft having the smallest gear-wheel to travel faster than the part of the chain passing over the pulley attached to the larger gear-wheel; or the gearwheels may be of the same diameter and the chain-pulleys of different diameters; or both chain-pulleys and gear-wheels may be of dif-' ferent diameters. The chain-pulleys may be provided with suitable sprockets or similar projections to prevent the chain or cable passing over them from slipping, and the loop of the chain formed by the part of the chain depending from the sides of the wheels next each other supports the sheave of the pulley-block,

is intended.

to which the weight to be moved is attached. A suitable swivel-hook is provided to attach the hoist to a support.

In order to more particularly describe my invention, reference is made to the accompanying drawings, in which- Figure 1 is a side view of one form of hoist. Fig. 2 is an end view of the same. Fig. 3 is a side view of another form of hoist.

The frame-work A is made of suitable size and strength to stand the strains to which the hoist will be subjected in the use for which it Upon a central shaft, B, supported in the frame, is the hand chain-wheel O, and upon the same shaft is fixed a pinionwheel, E. On opposite sides of the shaft 13 are located the shafts F and G, each carrying a gear-wheel, F and G, engaging with the pinion, and upon each of these shafts is secured a chain-pulley, F and G The chain H passes over the chain-pulleys, and in the inner loop thereof it supports the sheave I. of the pulleyblock J, having a hook, K. A swivel-hook, K, is securedto the top of the frame for supporting the hoist.

-In Fig. 1 the gears F and G are of different sizes and the chain-pulleys F and G are of the samesize, so that the pulleys will act differentially upon the weight in a well-known manner, and in Fig. 8 both the chain-pulleys and the gear-wheels engaging with the pinionwheel E are of different sizes.

Suitable projections, corru gations, or sprockets, a, may be provided to keep the chain or cable from slipping.

The operationlof the hoist is apparent, and need not be specifically described.

By this. construction it will be seen that I produce a verysimple, cheap, and durable hoist that is adapted to be made of any size, and one that is not liable to get out of order. By simply varying the size of the gear-wheels or chain-pulleys any desired relative action may be attained, so that the power or force exerted upon the hand-chain maybe multiplied as many times as is necessary to. raise the weight required.

Having thus described my invention, what I claim is I 1. The combination, substantially as herein described, with a frame-work, of a shaft carrying a hand chain-wheel and a pinion, and two gear-wheels engaging with said pinion 5 and operating the ehain-pulleys.

2. The combination, substantially as herein described, with the frame, of a pinion-shaft carrying the hand chain-wheel, a shaft on each side thereof having gears meshing with said 10 pinion, and chain-pulleys upon said shafts,

the arrangement being such that one chainpulley will move faster than the other.

3. A chain-hoist consisting of a frame, A,

shaft 13, carrying a pinion and hand chainwheel, shafts F "G, carrying gears F G and I 5 chain-pulleys F G chain H, passing over said pulleys, and a pu1ley-block, the whole adapted to form a differentially-acting hoisting apparatus, as set forth. I

In testimony whereof I have signed my name 20 to this specification in the presence of two subscribing witnesses CHARLES A. TEAL. Witnesses:

B. FRANK TEAL, 'VIc'roR S. DELACROIX. 

